Tunnel kiln



1,603,347 w. K. LJUNGDAHL TUNNEL KILN Original Filwd p 2 1922 HEAYING CHAMBER.

3 COOLING CHAMBER COOLJNG GAS CIRCUIT Patented @ct.

TUNNEL fientinuetion oi application Serial No. 591,035, filed September $36,

Ill), 1926.

vcntim relates more particularly to the con-' struction oil a coolingchamber employed in the process of extinguishin and cooling in condescent charcoal, in the accompanying" drawing which is by reference made a part of this specification, Fig, 1 iso vertical lonpgitudinal section of the retort and cooling chamber. The retort or kiln may he constructed for instance according: in patent of liminoil No. 748,457, but it is also unclerstood that it is not confined to this type of kilns only. Fig. 2 is :i plan view of the. cooling chamber and a part of the kiln or retort. 3 is a Vertical longitudinal section of cooling chamber and part 075 the kiln. clil'lllal figures refer to the similar parts iroughout the several drawings.

l hcn the material has been completely charred or treated in the kiln it is transferred in conveyor 13 from the kiln or retort into lock chamber 1 and then to the cooling silver 2 through the entrance door 3 in "5. 1 and The cooling chamber cons of. a horizontal closed chamber through which, in this case, the r eterial is moved from left to right and a current oi? gas cir culates aboo: the material contained in the conveyor in the opposite direction to the movementof the material. The used in the cooling" chanil derived partly from the material in the cooling c amhcr and partly from the kiln or retort. The cooling chamber 2 is equipped with a track as shown by the dotted line in Fig. 2 for the conveyors containing the charred material. Said cooling chan'iher is also equipped with lock chamber or exchange chamber 16, provided with doors l. The lock. chamber is of suilicient size to contain one conveyor,

The cooling chamber has an inclined rool I? and is provided with pipes (5 on the two outer sides of the chan'ibcr. Said pipes open into the (flllll'llltl at points indicated 1 '1'" and S in the cooling" chai'uber. it tho 1 oi? the cooling chambcr that close to the kiln said cooling pipes pen into the Serial No.

iriicn.

This application filed Jon's ci'mling cl'ianiher at "point 7 close to the roof. fit the other end the cooling cham- 55 her closed tm thc entrai ce oi? the lock cha nr l)C1' 16, said cooling pipes open into the chainher at the point F; but here close to the floor. 'lhc coolii'ig' chamber is also connected with the retort by means of a pipe 10 cquigimcd with a valve 9. l ly means of this coinieo lion gas can be drawn from the kiln to the cooling; chan'iher Where it is used a cooling medium, after it has suiiicicnllr cooled in the r rihcd will he node at this gas is llKlil' charcoal. It in the apparatus shown the cooing chamber isoi sufiicicnt else to 'lzon in four conveyors containing the material treated in the kiln, a conveyor may be taken out every two hours, thus the total time required to cool the charcoal is eight hours. cooling process of fzht hours this charcoal is absolutely sale to be handled in the ouhsidc atmosphere. (lther known methods for cooling charcoal require a time of twentyiour to forty-eight hours and more. course it is unrl 'stood that every tim a conveyor removed from above mentioned cooling chamber, another coi'iveyor with incandescent coal is trz'zns'ferred from the kiln through the lock chamber 14 and thence to the cooling chamber 2.

The ,o' in l e cooling chamber 2 is Withdrawn l l chamber at a point '2' ne'er to the roof of the cooling chsjinl r Where it. is the highesti it is then conveyed through the cooli pipes by means of fans 11' forcing the X into the pipes 6. These pipes pass through a Water i or spray from the perforated pipes 1, as shown in Fig. 2. The gas thus becoming cooled is then forced hack into the cooling chamber by the fans 11 and enters ata point. 8 and close to the floor as shown in. Fig 3. The traveling direction of the gas is as indicated by the arrows in Figs. 2 and 3. During the passage of the from the points 8 Where it is forced into the cooling chamber it, travels in a. direction opposite to that in which the conve 2' containing the nimtcriel trcatc .l, moves, thus the cool iirss striires the material in. the conveyor which has been in the cooling ch a niber for the longest period of time, then the cooled strikes the hotof the cooling process. The arrangement f the inclined root and the advantage thereof can readily be. seen and understood, being that a Warm gas always rises. The process as a Whole is carried on continuousl and v until the material treated has been su cient- 10 ly lowered in temperature so that it can be removed from the cooling chamber with out danger of ignition on being exposed to the atmosphere.

The time required for extinguishing and cooling by this process is much shorter than in any method now in use.

Having fully described my invention I claim and desire to protect by Letters Patent:

1. In a tunnel kiln in which the kiln chamber comprises a heating compartment and a cooling compartment adapted tobe successively traversed by the materiel passing through the kiln and includes means for separating said compartments from oneanother, the im rovement which consists in meansfor once a closed circuit of which the cooling cometing a cooling gas through 1 recast? partment constitutes a port, means for cooling said gas as it passes through the circuit, and means independent 0:? said separating means for optionally introducing gas into said cooling compartment from the heating compartment. A

2. In a tunnel kiln in which the lriln chamber comprises a heating compartment a closed circuit of which the cooling coirartment constitutes a part, means for coollng said gas as it passes through the circuit,

and valve controlled means independent of.

said separating means for optionally introducing gas into Said cooling compartment from the heating compartment, said coolin compartment havin. an inclined roof and an outlet port for the gas located adjacent the higher end of the compartment In testimony whereof, I have hereunto set my hand.

WILLIAM K. LJUEIGD.MLIL, 

